betting ticket; betting slip
Specifically a ticket purchased at a horse race track or off-track betting facility. The term is strongly associated with horse racing.
I went with a friend to buy horse racing tickets.
He bought a betting ticket at the racecourse.
My betting ticket won, and I got a considerable amount of money.
For the first time in a while, my ticket won and I was thrilled.
All of today's tickets ended up losing.
He picked the winning combination in a difficult race.
馬券 is a betting ticket for horse racing, while 舟券 is the equivalent ticket used for kyōtei (boat racing).
馬券 is counted with 枚, the standard counter for thin, flat objects like tickets and papers.
long-shot ticket; ticket paying 100x or more
off-track betting ticket
illegal bookie; unlicensed bookmaker
betting ticket office; ticket window (for horse racing)
Compound of 馬 (uma, 'horse') and 券 (ken, 'ticket'). The reading ばけん is a standard Sino-Japanese compound reading.